Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, PR China.
Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, PR China.
J Hazard Mater. 2024 Oct 5;478:135439. doi: 10.1016/j.jhazmat.2024.135439. Epub 2024 Aug 6.
Here, we present a first investigation of the inhibition mechanism of surfactant Triton X-100 (TX-100) on the oxidation degradation of polycyclic aromatic hydrocarbons (PAHs) in site soil aggregates using sodium citrate assisted Fe-activated persulfate (SC/Fe/PS). First, TX-100 was not only competed the adsorption sites of soil aggregates with PS, but also consumed PS, which inhibit the PAHs remediation rate in the TX-100 elution followed by the SC/Fe/PS oxidation system from 55.6 % in the oxidation system to 50.3 %. Furthermore, in the oxidation followed by elution system, PAHs was adsorbed on the iron minerals produced during the oxidation, which would be form a bound PAHs that was difficult to react with PS, and then re-eluted to the soil by the TX-100. Additionally, it was found that the oxidative and the elution efficiency of PAHs exhibited negative correlations with aggregate particle sizes. Finally, soil microorganism communities were more strongly changed by SC/Fe/PS oxidation and PAHs concentration than that of TX-100 elution, with obvious alterations bacteria than fungi, the effects of SC/Fe/PS and PAHs concentration on microorganism communities were opposite. This study provided a proof of regulating mechanisms for the site soil remediation using surfactants combined with the iron-PS system.
在这里，我们首次研究了表面活性剂 Triton X-100（TX-100）在柠檬酸辅助铁激活过硫酸盐（SC/Fe/PS）体系中抑制多环芳烃（PAHs）在现场土壤团聚体中氧化降解的抑制机制。首先，TX-100 不仅与 PS 竞争土壤团聚体的吸附位点，还消耗 PS，从而抑制了 TX-100 洗脱后 SC/Fe/PS 氧化体系中 PAHs 的修复率，从氧化体系中的 55.6%降至 50.3%。此外，在氧化后洗脱体系中，PAHs 被吸附在氧化过程中生成的铁矿物上，形成难与 PS 反应的结合态 PAHs，然后被 TX-100 重新洗脱到土壤中。此外，发现 PAHs 的氧化和洗脱效率与团聚体粒径呈负相关。最后，与 TX-100 洗脱相比，SC/Fe/PS 氧化和 PAHs 浓度对土壤微生物群落的影响更大，细菌的变化比真菌明显，SC/Fe/PS 和 PAHs 浓度对微生物群落的影响相反。本研究为使用表面活性剂结合铁-PS 系统进行现场土壤修复提供了调控机制的证据。
